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One of oOraikaOo's most notable works and also their first Rin/Len duet song.

According to oOraikaOo's video description on the song escapade, he stated "Codename "L" and "R"." saying it's a spy/agent-themed song. Interpretations are opened, in several PVs, it's interpreted that the Kagamines' went out of character in order to obtain information from said subject.